[Swlug] Raspberry Pi and Python - just a hello

[David Hodgkinson]

Which reminds me, I have a pi pollution detector gizmo somewhere if anyone wants it for a fiver plus postage.

> On 21 Jan 2022, at 21:38, Colin Law via Swlug <swlug at mailman.lug.org.uk> wrote:
> 
> On Fri, 21 Jan 2022 at 01:00, Rhys Sage via Swlug
> <swlug at mailman.lug.org.uk> wrote:
>> 
>> Colin. That Node-red looks interesting. Can it handle multiple inputs and outputs from multiple boards using a board expander? I have a servo hat, a GPS mouse, altimeter/pressure sensor/temperature sensor thingy and a few other gizmos that will all have to be run simulteneously to put together an operational single-engine wingbourne drone.
>> 
> 
> Generally, yes, it can handle pretty much anything.  Some stuff comes
> with libraries (often Python) and if node-red can't easily talk to it
> directly then it can run a python script to get the data, either
> running it when required or via a long-running service which
> communicates back to node red using something like MQTT, which is
> almost trivial to use both in node-red and in python.  If you don't
> know about MQTT then it is a great way to communicate between
> processes or systems across a network, or even across the internet.
> Have a look at https://www.hivemq.com/mqtt-essentials/
> 
> 
> Colin
> 
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